Max damage for 1 round could be very good indeed. Go with it.
Yes, I did, but I don't have any real knowledge about utilizing swarms, so I can't really give you any advice about it.
As for your few spells amongst your guns, I'll do those now (getting Swashbuckler coded for posting will probably take a couple of hours, so it can wait for tomorrow).
BEES!: If the swarm is similar to that from Summon Swarm (see my second line!), and you get greater control, I'd say it's good.
Cloud of Caltrops: Up it to a 30' cone, and it should work fine for a 4th level spell. Also, you missed an 'a' in area.
Death by Spork: Increase the area & range, to a 120' line, and it is better for 4th level.
Launch Spikes: The damage feels a bit weak for 2nd level. I'd suggest upping it to 2d8 + level, or 1d4 per level, max 10. The first option makes the damage much better at low levels, while the second makes a nicely scaling damage that makes the spell more attractive at higher levels, while still below what you'd get from a 3rd level spell.